Fresnel number

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What Wikipedia says

In optics, in particular scalar diffraction theory, the Fresnel number (F), named after the physicist Augustin-Jean Fresnel, is a dimensionless number relating to the pattern a beam of light forms on a surface when projected through an aperture.

Excerpt from the Wikipedia article “Fresnel number”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: E Rosette after a painting by A Tardieu, Public domain, via Wikimedia Commons.